<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>引导页 </title>


<style type="text/css"> 

* {
	margin: 0; 
	padding: 0;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	-ms-box-sizing: border-box;
	-o-box-sizing: border-box;
	box-sizing: border-box;
}
html, body {
	margin: 0;
	padding: 0;
	font: 16px/1.4 'Lato', sans-serif;
	color: #fefeff;
	-webkit-font-smoothing: antialiased;
	font-smoothing: antialiased;
}
body {
	background: rgb(8,5,16);
	overflow:hidden;
	-webkit-touch-callout: none;
	-webkit-user-select: none;
	-khtml-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
}

h1 {
	font: 2.75em 'Cinzel', serif;
	font-weight: 400;
	letter-spacing: 0.35em;
	text-shadow: 0 0 25px rgba(254,254,255,0.85);
}
h2 {
	font: 1.45em 'Cinzel', serif;
	font-weight: 400;
	letter-spacing: 0.5em;
	text-shadow: 0 0 25px rgba(254,254,255,0.85);
	text-transform: lowercase;
}

[class^="letter"] {
	-webkit-transition: opacity 3s ease;
	-moz-transition: opacity 3s ease;
	transition: opacity 3s ease;
}
.letter-0  { transition-delay: 0.2s; }
.letter-1  { transition-delay: 0.4s; }
.letter-2  { transition-delay: 0.6s; }
.letter-3  { transition-delay: 0.8s; }
.letter-4  { transition-delay: 1.0s; }
.letter-5  { transition-delay: 1.2s; }
.letter-6  { transition-delay: 1.4s; }
.letter-7  { transition-delay: 1.6s; }
.letter-8  { transition-delay: 1.8s; }
.letter-9  { transition-delay: 2.0s; }
.letter-10 { transition-delay: 2.2s; }
.letter-11 { transition-delay: 2.4s; }
.letter-12 { transition-delay: 2.6s; }
.letter-13 { transition-delay: 2.8s; }
.letter-14 { transition-delay: 3.0s; }

h1, h2 {
	visibility: hidden;
	-webkit-transform: translate3d(0, 0, 0);
	-moz-transform: translate3d(0, 0, 0);
	transform: translate3d(0, 0, 0);
}	
h1.transition-in,
h2.transition-in {
	visibility: visible;
}
h1 [class^="letter"], 
h2 [class^="letter"] {
	opacity: 0;
}
h1.transition-in [class^="letter"],
h2.transition-in [class^="letter"] {
	opacity: 1;
}

#container {
display: table;
position: absolute;
z-index: 20;
width: 100%;
height: 100%;
text-align: center;
cursor: none;
left: 15px;
}
#container > div {
	display: table-cell;
	vertical-align: middle;
}
#container p {
	position: absolute;
	width: 100%;
	left: 0;
	bottom: 25px;
	font-size: 0.8em;
	letter-spacing: 0.1em;
	font-weight: 300;
	color: #76747a;
	-webkit-font-smoothing: subpixel-antialiased;
	font-smoothing: subpixel-antialiased; 
}
#container p strong {
color: #b3abc5;
font-size: 5em;
}
#container p span {
	font-size: 0.75em;
	padding: 0 2px;
}

#canvas {
	position: absolute;
	z-index: 10;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	cursor: none;
}

#stats { 
	position: absolute; 
	z-index: 10; 
	left: 10px; 
	top: 10px; 
}

.dg.ac {
	z-index: 100 !important;
}

#container div p strong a {
color: #999;
font-size: 0.5em;
}
body,td,th {
font-family: Lato, sans-serif;
}
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
text-decoration: none;
}
a:active {
text-decoration: none;
}
</style>
</head>
<body ondragstart="window.event.returnValue=false" oncontextmenu="window.event.returnValue=false" onselectstart="event.returnValue=false">

<div id="container">

	<div>
		<h1 id="h1"> 用代码将梦想照进现实 </h1>
		<h2 id="h2"> 【专注致力于开发炫酷狂拽吊炸天特效】 </h2>
		<h3 id="h2">html5跟随鼠标炫酷动画特效→→→纵享丝滑</h3>
		<p>&nbsp;</p>
		
		<p>&nbsp;</p>
	  <p>&nbsp;</p>
		<p>&nbsp;</p>
		<p>&nbsp;</p>
		<p>&nbsp;</p>
	</div>

</div>

<canvas id="canvas"></canvas>

<audio autoplay="autoplay">
	<source src="http://www.ntzyw.cn" type="audio/ogg">
	<source src="http://p2014.yaotou.com:8081/2014%2F2014-4%2F2014-4-20%2F2014420203237.m4a" type="audio/mpeg">
</audio>


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<script>

;(function(window) {

var ctx,
	hue,
	logo,
	form,
	buffer,
	target = {},
	tendrils = [],
	settings = {};

settings.debug = true;
settings.friction = 0.5;
settings.trails = 20;
settings.size = 50;
settings.dampening = 0.25;
settings.tension = 0.98;

Math.TWO_PI = Math.PI * 2;

// ========================================================================================
// Oscillator
// ----------------------------------------------------------------------------------------

function Oscillator(options) {
	this.init(options || {});
}

Oscillator.prototype = (function() {
	
	var value = 0;
	
	return {
		
		init: function(options) {
			this.phase = options.phase || 0;
			this.offset = options.offset || 0;
			this.frequency = options.frequency || 0.001;
			this.amplitude = options.amplitude || 1;
		},
		
		update: function() {
			this.phase += this.frequency;
			value = this.offset + Math.sin(this.phase) * this.amplitude;
			return value;
		},
		
		value: function() {
			return value;
		}
	};
		
})();

// ========================================================================================
// Tendril
// ----------------------------------------------------------------------------------------

function Tendril(options) {
	this.init(options || {});
}

Tendril.prototype = (function() {
	
	function Node() {
		this.x = 0;
		this.y = 0;
		this.vy = 0;
		this.vx = 0;
	}
	
	return {
	
		init: function(options) {
			
			this.spring = options.spring + (Math.random() * 0.1) - 0.05; 
			this.friction = settings.friction + (Math.random() * 0.01) - 0.005;
			this.nodes = [];
			
			for(var i = 0, node; i < settings.size; i++) {
		
				node = new Node();
				node.x = target.x;
				node.y = target.y;
		
				this.nodes.push(node);
			}	
		},
		
		update: function() {
			
			var spring = this.spring,
				node = this.nodes[0];
			
			node.vx += (target.x - node.x) * spring;
			node.vy += (target.y - node.y) * spring;
			
			for(var prev, i = 0, n = this.nodes.length; i < n; i++) {

				node = this.nodes[i];
				
				if(i > 0) {
					
					prev = this.nodes[i - 1];
					
					node.vx += (prev.x - node.x) * spring;
					node.vy += (prev.y - node.y) * spring;
					node.vx += prev.vx * settings.dampening;
					node.vy += prev.vy * settings.dampening;
				}
				
				node.vx *= this.friction;
				node.vy *= this.friction;
				node.x += node.vx;
				node.y += node.vy;
				
				spring *= settings.tension;
			}
		},

		draw: function() {
		
			var x = this.nodes[0].x, 
				y = this.nodes[0].y,
				a, b;
			
			ctx.beginPath();
			ctx.moveTo(x, y);
			
			for(var i = 1, n = this.nodes.length - 2; i < n; i++) {
				
				a = this.nodes[i];
				b = this.nodes[i + 1];
				x = (a.x + b.x) * 0.5;
				y = (a.y + b.y) * 0.5;
				
				ctx.quadraticCurveTo(a.x, a.y, x, y);
			}
			
			a = this.nodes[i];
			b = this.nodes[i + 1];
			
			ctx.quadraticCurveTo(a.x, a.y, b.x, b.y);
			ctx.stroke();
			ctx.closePath();
		}
	};

})();

// ----------------------------------------------------------------------------------------

function init(event) {

	document.removeEventListener('mousemove', init);
	document.removeEventListener('touchstart', init);
	
	document.addEventListener('mousemove', mousemove);
	document.addEventListener('touchmove', mousemove);
	document.addEventListener('touchstart', touchstart);
	
	mousemove(event);
	reset();
	loop();
}

function reset() {
	
	tendrils = [];

	for(var i = 0; i < settings.trails; i++) {
		
		tendrils.push(new Tendril({
			spring: 0.45 + 0.025 * (i / settings.trails)
		}));
	}
}

function loop() {
	
	if(!ctx.running) return;

	ctx.globalCompositeOperation = 'source-over';
	ctx.fillStyle = 'rgba(8,5,16,0.4)';
	ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
	ctx.globalCompositeOperation = 'lighter';
	ctx.strokeStyle = 'hsla(' + Math.round(hue.update()) + ',90%,50%,0.25)';
	ctx.lineWidth = 1;
	
	if(ctx.frame % 60 == 0) {
		console.log(hue.update(), Math.round(hue.update()), hue.phase, hue.offset, hue.frequency, hue.amplitude);
	}
	
	for(var i = 0, tendril; i < settings.trails; i++) {
		tendril = tendrils[i];
		tendril.update();
		tendril.draw();
	}
	
	ctx.frame++;
	ctx.stats.update();
	requestAnimFrame(loop);
}

function resize() {
	ctx.canvas.width = window.innerWidth;
	ctx.canvas.height = window.innerHeight;
}

function start() {
	if(!ctx.running) {
		ctx.running = true;
		loop();
	}
}

function stop() {
	ctx.running = false;
}

function mousemove(event) {
	if(event.touches) {
		target.x = event.touches[0].pageX;
		target.y = event.touches[0].pageY;
	} else {
		target.x = event.clientX
		target.y = event.clientY;
	}
	event.preventDefault();
}

function touchstart(event) {
	if(event.touches.length == 1) {
		target.x = event.touches[0].pageX;
		target.y = event.touches[0].pageY;
	}
}

function keyup(event) {
	
	switch(event.keyCode) {
		case 32:
			save();
			break;
		default: 
			// console.log(event.keyCode);
	}
}

function letters(id) {

	var el = document.getElementById(id),
		letters = el.innerHTML.replace('&amp;', '&').split(''),
		heading = '';
	
	for(var i = 0, n = letters.length, letter; i < n; i++) {
		letter = letters[i].replace('&', '&amp');
		heading += letter.trim() ? '<span class="letter-' + i + '">' + letter + '</span>' : '&nbsp;';
	}
	
	el.innerHTML = heading;
	setTimeout(function() { 
		el.className = 'transition-in';	
	}, (Math.random() * 500) + 500);
}

function save() {

	if(!buffer) {
		
		buffer = document.createElement('canvas');
		buffer.width = screen.availWidth;
		buffer.height = screen.availHeight;
		buffer.ctx = buffer.getContext('2d');
		
		form = document.createElement('form');
		form.method = 'post';
		form.input = document.createElement('input');
		form.input.type = 'hidden';
		form.input.name = 'data';
		form.appendChild(form.input);
		
		document.body.appendChild(form);
	}

	buffer.ctx.fillStyle = 'rgba(8,5,16)';
	buffer.ctx.fillRect(0, 0, buffer.width, buffer.height);
	
	buffer.ctx.drawImage(canvas,
		Math.round(buffer.width / 2 - canvas.width / 2), 
		Math.round(buffer.height / 2 - canvas.height / 2)
	);
	
	buffer.ctx.drawImage(logo,
		Math.round(buffer.width / 2 - logo.width / 4), 
		Math.round(buffer.height / 2 - logo.height / 4),
		logo.width / 2,
		logo.height / 2
	);
	
	window.open(buffer.toDataURL(), 'wallpaper', 'top=0,left=0,width=' + buffer.width + ',height=' + buffer.height);
	
	// form.input.value = buffer.toDataURL().substr(22);
	// form.submit();
}

window.requestAnimFrame = (function() {
	return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(fn) { window.setTimeout(fn, 1000 / 60) };
})();

window.onload = function() {
	
	ctx = document.getElementById('canvas').getContext('2d');
	ctx.stats = new Stats();
	ctx.running = true;
	ctx.frame = 1;
	
	logo = new Image();
	logo.src = 'http://labs.nikrowell.com/lightsandmotion/ultraviolet/images/logo.png';
	
	hue = new Oscillator({
		phase: Math.random() * Math.TWO_PI,
		amplitude: 85,
		frequency: 0.0015,
		offset: 285
	});
	
	letters('h1');
	letters('h2');
	
	document.addEventListener('mousemove', init);
	document.addEventListener('touchstart', init);
	document.body.addEventListener('orientationchange', resize);
	window.addEventListener('resize', resize);
	window.addEventListener('keyup', keyup);
	window.addEventListener('focus', start);
	window.addEventListener('blur', stop);
	
	resize();
	
	if(window.DEBUG) {
		
		var gui = new dat.GUI();
		
		// gui.add(settings, 'debug');
		settings.gui.add(settings, 'trails', 1, 30).onChange(reset);
		settings.gui.add(settings, 'size', 25, 75).onFinishChange(reset);
		settings.gui.add(settings, 'friction', 0.45, 0.55).onFinishChange(reset);
		settings.gui.add(settings, 'dampening', 0.01, 0.4).onFinishChange(reset);
		settings.gui.add(settings, 'tension', 0.95, 0.999).onFinishChange(reset);	
		
		document.body.appendChild(ctx.stats.domElement);
	}
};

})(window);

</script>

</body>
</html>
